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Acanthagrion Marinae Sp. Nov. (Zygoptera: Coenagrionidae): a New Species of the Apicale Group

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Acanthagrion Marinae Sp. Nov. (Zygoptera: Coenagrionidae): a New Species of the Apicale Group Anais da Academia Brasileira de Ciências (2018) 90(3): 2865-2872 (Annals of the Brazilian Academy of Sciences) Printed version ISSN 0001-3765 / Online version ISSN 1678-2690 http://dx.doi.org/10.1590/0001-3765201820170715 www.scielo.br/aabc | www.fb.com/aabcjournal Acanthagrion marinae sp. nov. (Zygoptera: Coenagrionidae): a new species of the apicale group FEDERICO LOZANO1 and MARCIEL E. RODRIGUES2 1Laboratorio de Biodiversidad y Genética Ambiental/BioGeA, Universidad Nacional de Avellaneda, Mario Bravo 1460 esq. Isleta, 1870 Piñeyro, Buenos Aires, Argentina 2Departamento de Ciências Biológicas, Universidade Estadual de Santa Cruz, Rodovia Jorge Amado, Km 16, 45662-900 Ilhéus, BA, Brazil Manuscript received on September 11, 2017; accepted for publication on February 5, 2018 ABSTRACT Acanthagrion marinae sp. nov. (Holotype male: BRASIL, Mato Grosso do Sul, Campo Grande, UFMS, 20°29’56.26’’S - 54°36’48.43’’W, 547m, leg. M.E. Rodrigues, 03.ii.2015, collection code: VZYG437, MLP) is described and illustrated on the basis of 15 males. The new species belongs to the apicale species group by having horns on S10 and sclerotized hooks on tip of distal segment of the genital ligula. It can be easily distinguished from other species of the group by a combination of characters of the genital ligulae (presence of setae on segment two; absence of setae at flexure; distal lateral lobes of segment three absent). Notes on habitat and a modification of previous keys for the species of theapicale group are provided. Key words: Acanthagrion, Coenagrionidae, Neotropics, Odonata, Zygoptera. INTRODUCTION cerci decumbent forming an angle of 45° with posterior margin of S10, with dorso-basal tubercle; The neotropical genus Acanthagrion was erected females without a well defined mesepisternal in 1876 by Baron Edmond Selys-Longchamps to carina between mesostigmal plates and medio- include nine species of Coenagrionidae. Currently dorsal carina, generally with mesepisternal fossae it includes 44 coenagrionids ranging from Texas on the dorsum of the pterothorax and vulvar spine (USA) to Buenos Aires (Argentina) (Garrison on abdominal segment S8. et al. 2010, Machado 2012). According to von Leonard (1977) provided the first revision of Ellenrieder and Lozano (2008) and Garrison et the genus in which he defined nine species groups. al. (2010) species of Acanthagrion are small to The three species originally included within the medium size with wings generally hyaline, CuP apicale species group (A. apicale, A. obsoletum, of HW reaching posterior margin of wing; flexure and A. phallicorne) share the presence of horns of male genital ligula short with lateral lobes of in S10 of males, elevated mesepisternal fossae in segment 3, when present, distal to flexure; male females, and presence of orange coloration in head Correspondence to: Federico Lozano and thorax of mature specimens. Acanthagrion E-mail: [email protected] apicale and A. obsoletum also share the presence An Acad Bras Cienc (2018) 90 (3) 2866 FEDERICO LOZANO and MARCIEL E. RODRIGUES of sclerotized hooks on either side of the tip Westfall and May (2006). Color pattern of head and of distal segment of genital ligula. Muzón and abdomen follows Lozano (2013). Lozano (2005) described A. hartei from Ecuador Collection acronyms used in the text: and included it within the apicale group, based BioGeA: Laboratorio de Biodiversidad y on shared characters with its members. Recently Genética Ambiental, Avellaneda, Argentina Machado (2012) provided a revision of the group MLP: Departamento Científico Entomología, and added four new species (A. chicomendesi, A. Museo de La Plata, La Plata, Argentina flaviae, A. kaori, and A. triangulare), and accorded UFMS: Universidade Federal de Mato Grosso specific rank for Fraser’s A. apicale descendens, do Sul, Mato Grosso do Sul, Brazil bringing the total number of species of the group UFSCAR: Universidade Federal de São to nine. Carlos, São Paulo, Brazil In this contribution a new species of the Measurements are given in mm. A list of apicale species group from Brazil and Paraguay is examined material is provided; country, department, described, diagnosed and illustrated. state, province or any other political/administrative The ZooBank Life Science Identifer (LSID) equivalent subdivision, locality (names of localities of this publication is: urn:lsid:zoobank.org:pub: were transcribed from the label and are not translated 0951B791-04E1-41E5-8731-E71E3D57CD96. to English), geographic coordinates and altitude, collector/s, date of collection, number and sex of MATERIALS AND METHODS specimens, and deposition of material are indicated. When geographic coordinates were not included Specimens were studied with the aid of a Leica in the original label, they were culled from the MS5 stereomicroscope in the Laboratorio de Global Gazetteer website (http://www.fallingrain. Biodiversidad y Genética Ambiental (BioGeA) com/world/) with the aid of Google Earth version of the Universidad Nacional de Avellaneda 7.1.7.2606, and these data are enclosed in braces ({ }). (UNDAV). Illustrations were made with the aid of The map was created electronically using QGIS digital camera coupled to the stereomicroscope and version 2.16.3. an open-source design program (Inkscape version 0.91. at www.inkscape) and are not to scale. RESULTS Specimens for SEM were cleaned in acetone, air Acanthagrion marinae sp. nov. dried and mounted on SEM stubs with carbon- ZooBank Life Science Identifer (LSID) - conductive adhesive tabs, and then sputter coated urn:lsid:zoobank.org:act:D1F0D354-41FC-444A- with gold/ palladium alloy and examined with a B57B-71CBA362904C Jeol JSM 6360 LV scanning electron microscope Types. Holotype ♂: BRASIL, Mato Grosso do in the Museo de La Plata, Buenos Aires, Argentina. Sul, Campo Grande, UFMS, 20°29’56.26’’S - Wing venation follows Riek and Kukalová- 54°36’48.43’’W, 547m, leg. M.E. Rodrigues, Peck (1984), modified by Bechly (1996). 03.ii.2015, MLP. Paratypes 14 ♂: BRASIL, Abbreviations for structures used throughout the Mato Grosso do Sul: Campo Grande, Anhanduí, text are as follows: FW: forewing; HW: hindwing; 20°30’24.18’’S - 54°38’28.60’’W, 507m, leg. pt: pterostigma; Ax: antenodals; Px: postnodals; M.E. Rodrigues, 24.xi.2014, 3♂, UFSCAR; pt: pterostigma. S1–10: abdominal segments 1 to Campo Grande, Brejo bonito, 20°32’05.96’’S 10. Color pattern terminology of thorax follows - 54°44’52.91’’W, 493m, leg. M.E. Rodrigues, An Acad Bras Cienc (2018) 90 (3) Acanthagrion marinae sp. nov. 2867 15.xi.2014, 1♂, MLP; Campo Grande, Córrego segment 2 is only shared with A. phallicorne; Bandeira, 20°29’33.68’’S - 54°34’44.50’’W, 598m, from which it can be easily separated because A. leg. L.C. Alves, 16.i.2015, 1♂, MLP; Campo marinae lacks setae on flexure. Tip of segment 3 Grande, Cotia, 20°32’37.78’’S - 54°41’29.08’’W, with sclerotized hooks on either side. 508m, leg. L.C. Alves, 22.i.2015, 3♂, MLP; Description of holotype male (Fig. 1): Campo Grande, Lageado, 20°32’26.99’’S - Head. Labrum light blue postero-median spot 54°38’23.64’’W, 498m, leg. L.C. Alves, 20.i.2015, black; anteclypeus light blue; postclypeus light blue 1♂, MLP; Campo Grande, Morada do sol, with two black spots and posterior margin black; 20°39’18.94’’S - 54°21’59.53’’W, 544m, leg. antefrons light blue; epicranium mostly black E.B. Moura, 16.i.2015, 1♂, MLP; Campo Grande, with two greenish light blue spots behind scape, Norberto, 20°34’16.61’’S - 54°36’31.33’’W, a very diffuse greenish spot next to each ocellus, 536m, leg. M.E. Rodrigues, 24.xi.2014, 2♂, a T-shaped spot within ocellar triangle; occipital BioGeA; Campo Grande, Prainha, 20°33’57.66’’S bar greenish light blue; antennifer and scape - 54°30’21.21’’W, 602m, leg. M.E. Rodrigues, anteriorly light blue, posteriorly black; reminder 02.ii.2015, 1♂, MLP. PARAGUAY, Cerro Corá, of the antenna missing; postocular spots greenish {22°37’00’’S - 55°59’00’’W, 266m}, leg. L.A. light blue, subrectangular, approximately equal Bulla, 30.xi.1973, 1♂, MLP. in size to ocellar triangle; most posterior point of Specimens examined. 15♂ head located at compound eyes; occipital area pale brown, except for two dark brown rounded spots on ETYMOLOGY each side of occipital foramen. The name marinae (Latinized genitive feminine Prothorax. Anterior lobe with central spot noun) pays homage to the memory of Marina dos greenish light blue occupying almost all of dorsum, Santos Rodrigues, mother of Marciel E. Rodrigues remainder of dorsum black, mostly black laterally one of the authors of this article. except for narrow anterior greenish light blue spot; middle lobe entirely black, dorsolateral spots DIAGNOSIS greenish light blue, propleuron greenish light blue; Pale color areas of head and thorax are light blue; posterior lobe black with greenish light blue lateral this can easily differentiate A. marinae from most streaks; lateral margins rounded lacking a medial other species included within the apicale group projection. (except for A. descendens and some specimens of Pterothorax (Fig. 1a). Predominantly greenish A. obsoletum). However, coloration has proven light blue. Mid-dorsal black stripe not interrupted at not to be a reliable character since other orange middorsal carina; antealar sinus black; antehumeral species within Acanthagrion (A. obsoletum and A. ascendens) have both morphs (Machado 2012). Acanthagrion marinae has horns on S10 with tips rounded, directed dorso-posteriorly and not surpassing distal margin of S10; this combination of characters is unique within the apicale group. Cerci with inner margin straight longer than the length of S10 can easily differentiate this species Figure 1 - a. Holotype, general view; b. Holotype, terminalia from A. obsoletum. Genital ligulae with setae on lateral view. An Acad Bras Cienc (2018) 90 (3) 2868 FEDERICO LOZANO and MARCIEL E.
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